Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

!!!HELP!!! Swap almost complete car wont start!

Thread Tools
 
Search this Thread
 
Old Aug 5, 2010 | 09:57 PM
  #1  
twin74s's Avatar
Thread Starter
11 Second Club
iTrader: (10)
 
Joined: Sep 2007
Posts: 207
Likes: 0
From: branson missouri
Default !!!HELP!!! Swap almost complete car wont start!

Heres the scoop. 07 LY6 E38 ecm. Have Crank, Cam signal. Has spark. No injector pulse. VATS is disabled and car will run if you spray brake clean in the intake. My Modis scanner shows that it has injectors pulse. HP tuners shows injector pulse but i never get a noid signal. All injectors have power during cranking and key on.

Things im not sure of. Accessory wakeup serial data wire?
What does this do and what should it be hooked too?

With a volt meter hooked to power and to the ground side of the injector wire it will show ground with key on. Normal? But the ground will not light a test light.

Any help would be greatly appreciated.

THanks David
Reply
Old Aug 5, 2010 | 10:22 PM
  #2  
-TheBandit-'s Avatar
TECH Addict
15 Year Member
Photogenic
Liked
Loved
iTrader: (1)
 
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
Default

Have you checked that you are getting fuel to the rails?
Do you have adequate/substantial grounding for everything?
Reply
Old Aug 5, 2010 | 10:24 PM
  #3  
ls1nova71's Avatar
TECH Veteran
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (4)
 
Joined: Jan 2008
Posts: 4,406
Likes: 211
From: Liberty, MO
Default

Stuck injectors? How long has the engine sat?
Reply
Old Aug 6, 2010 | 07:04 AM
  #4  
twin74s's Avatar
Thread Starter
11 Second Club
iTrader: (10)
 
Joined: Sep 2007
Posts: 207
Likes: 0
From: branson missouri
Default

Originally Posted by -TheBandit-
Have you checked that you are getting fuel to the rails?
Do you have adequate/substantial grounding for everything?
Have Good PCM grounds. Engine cranks great, all other sensors work.

Originally Posted by ls1nova71
Stuck injectors? How long has the engine sat?
There is no injector pulse at the injector therefore they never open. If i ground the injector manually they will open just fine.
Reply
Old Aug 6, 2010 | 10:20 AM
  #5  
Marky522's Avatar
On The Tree
iTrader: (8)
 
Joined: May 2009
Posts: 199
Likes: 1
Default

I would voltage drop the ground side using the scope on your modis (nice tool, I will be upgrading to one soon).

Mark
Reply
Old Aug 6, 2010 | 07:03 PM
  #6  
twin74s's Avatar
Thread Starter
11 Second Club
iTrader: (10)
 
Joined: Sep 2007
Posts: 207
Likes: 0
From: branson missouri
Default

Originally Posted by Marky522
I would voltage drop the ground side using the scope on your modis (nice tool, I will be upgrading to one soon).

Mark
Im not very versed with it yet... Not sure how to do that.
Reply
Old Aug 7, 2010 | 09:38 AM
  #7  
coryfanning's Avatar
Registered User
 
Joined: Aug 2010
Posts: 2
Likes: 0
Default I've got the same problem

I've got the same problem. Have you figured it out yet?
Reply
Old Aug 7, 2010 | 11:18 AM
  #8  
cutlass_455's Avatar
TECH Enthusiast
iTrader: (2)
 
Joined: Aug 2008
Posts: 617
Likes: 0
From: Alberta, Canada
Default

When I went to fire my conversion for the first time, it didnt want to fire. I had everything done correctly, but it just wouldnt fire. Sprayed starting fluid in the intake and it lit and died. Ended up being plugged injectors.

Make sure you fuel in the rail and the injectors arent plugged is the moral of my story I guess.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
Old Aug 7, 2010 | 05:50 PM
  #9  
twin74s's Avatar
Thread Starter
11 Second Club
iTrader: (10)
 
Joined: Sep 2007
Posts: 207
Likes: 0
From: branson missouri
Default

Originally Posted by cutlass_455
When I went to fire my conversion for the first time, it didnt want to fire. I had everything done correctly, but it just wouldnt fire. Sprayed starting fluid in the intake and it lit and died. Ended up being plugged injectors.

Make sure you fuel in the rail and the injectors arent plugged is the moral of my story I guess.
IT has no injector pulse...They will never open stuck or not without it.

Originally Posted by coryfanning
I've got the same problem. Have you figured it out yet?
NO i have made a few calls around and everyone keeps telling me its VATS but my tuner says that it is off. so im just sitting here twiddling my thumbs
Reply
Old Aug 7, 2010 | 08:09 PM
  #10  
99MUSTANG5.3L's Avatar
TECH Regular
 
Joined: Oct 2009
Posts: 482
Likes: 0
From: Whitehall,PA
Default

From what I understand about the LSx series engines is that they get the injector pulse from the ECM via the ground. I would just double check the injector wiring in your harness. I would start with continuity checks on the injector power and ground. Beats twiddling your thumbs!
Reply
Old Aug 8, 2010 | 06:32 PM
  #11  
twin74s's Avatar
Thread Starter
11 Second Club
iTrader: (10)
 
Joined: Sep 2007
Posts: 207
Likes: 0
From: branson missouri
Default

Originally Posted by 99MUSTANG5.3L
From what I understand about the LSx series engines is that they get the injector pulse from the ECM via the ground. I would just double check the injector wiring in your harness. I would start with continuity checks on the injector power and ground. Beats twiddling your thumbs!

Going out tonight to work on it some more. Going to start with all the things that i think are working. Start with the basics.
Reply
Old Aug 25, 2010 | 07:58 PM
  #12  
NSTIGATR's Avatar
On The Tree
iTrader: (4)
 
Joined: Dec 2007
Posts: 188
Likes: 0
Default

any update?? im having the same problem
Reply
Old Aug 26, 2010 | 09:48 AM
  #13  
-TheBandit-'s Avatar
TECH Addict
15 Year Member
Photogenic
Liked
Loved
iTrader: (1)
 
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
Default

Originally Posted by NSTIGATR
any update?? im having the same problem
Yes he got it working. The starter enable wire needed to be grounded or starter check needed to be disabled in the PCM. https://ls1tech.com/forums/conversio...l#post13762641
Reply




All times are GMT -5. The time now is 12:16 PM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE